Her best-known song was Pierwszy siwy włos (First Gray Hair), a nostalgic tango written by Kazimierz Winkler and Henryk Hubertus Jabłoński originally for singer Mieczysław Fogg.
[1] While still in Warsaw immediately before the outbreak of World War II, she became involved with the Ali Baba Theatre, established by the entertainer Kazimierz Krukowski.
Under her cover name 'Marta', she entered and won a talent contest in Vilnius in 1940, after which she sang in the city at the popular nightclub Sztralla Artystów, as well as engagements in 1940-1941 with the orchestra of Ludwik Sempolinski and entertainer Janusz Minkiewicz's satirical cabaret "Ksantyp".
After the war, she settled in Lódź and began a long collaboration with the Lopatowski Brothers Orchestra that resulted in a string of recordings including the hits Czy pamiętasz tę noc w Zakopanem?
As her popularity grew, in 1950 Mirska received an invitation from Warsaw to work with the well-known Polish Radio Dance Orchestra.
Her plaintive and heart-felt interpretation of Pierwszy siwy włos (First Gray Hair) became a great radio hit in 1956, and became the most requested song at her concerts for the rest of her career.